#ifndef __GETOPT_H__
/**
* DISCLAIMER
* This file is part of the mingw-w64 runtime package.
*
* The mingw-w64 runtime package and its code is distributed in the hope that it
* will be useful but WITHOUT ANY WARRANTY.  ALL WARRANTIES, EXPRESSED OR
* IMPLIED ARE HEREBY DISCLAIMED.  This includes but is not limited to
* warranties of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* Copyright (c) 2002 Todd C. Miller <Todd.Miller@courtesan.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Sponsored in part by the Defense Advanced Research Projects
* Agency (DARPA) and Air Force Research Laboratory, Air Force
* Materiel Command, USAF, under agreement number F39502-99-1-0512.
*/
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Dieter Baron and Thomas Klausner.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#pragma warning(disable:4996)

#define __GETOPT_H__

/* All the headers include this file. */
#include <crtdefs.h>
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <cstdarg>
#include <cstdio>
#include <windows.h>

#ifdef __cplusplus
extern "C" {
#endif

#define	REPLACE_GETOPT		/* use this getopt as the system getopt(3) */

#ifdef REPLACE_GETOPT
    int	opterr = 1;		/* if error message should be printed */
    int	optind = 1;		/* index into parent argv vector */
    int	optopt = '?';		/* character checked for validity */
#undef	optreset		/* see getopt.h */
#define	optreset		__mingw_optreset
    int	optreset;		/* reset getopt */
    const char* optarg; /* argument associated with option */
#endif

                            //extern int optind;		/* index of first non-option in argv      */
                            //extern int optopt;		/* single option character, as parsed     */
                            //extern int opterr;		/* flag to enable built-in diagnostics... */
                            //				/* (user may set to zero, to suppress)    */
                            //
                            //extern char *optarg;		/* pointer to argument of current option  */

#define PRINT_ERROR	((opterr) && (*options != ':'))

#define FLAG_PERMUTE	0x01	/* permute non-options to the end of argv */
#define FLAG_ALLARGS	0x02	/* treat non-options as args to option "-1" */
#define FLAG_LONGONLY	0x04	/* operate as getopt_long_only */

                            /* return values */
#define	BADCH		(int)'?'
#define	BADARG		((*options == ':') ? (int)':' : (int)'?')
#define	INORDER 	(int)1

#ifndef __CYGWIN__
#define __progname __argv[0]
#else
    extern char __declspec(dllimport) *__progname;
#endif

#ifdef __CYGWIN__
    static char EMSG[] = "";
#else
#define	EMSG		""
#endif

    static int getopt_internal(int, char * const *, const char *,
        const struct option *, int *, int);
    static int parse_long_options(char * const *, const char *,
        const struct option *, int *, int);
    static int gcd(int, int);
    static void permute_args(int, int, int, char * const *);

    static const char* place = EMSG; /* option letter processing */

    /* XXX: set optreset to 1 rather than these two */
    static int nonopt_start = -1; /* first non option argument (for permute) */
    static int nonopt_end = -1;   /* first option after non options (for permute) */

                                  /* Error messages */
    static const char recargchar[] = "option requires an argument -- %c";
    static const char recargstring[] = "option requires an argument -- %s";
    static const char ambig[] = "ambiguous option -- %.*s";
    static const char noarg[] = "option doesn't take an argument -- %.*s";
    static const char illoptchar[] = "unknown option -- %c";
    static const char illoptstring[] = "unknown option -- %s";

    static void
        _vwarnx(const char *fmt, va_list ap)
    {
        (void)fprintf(stderr, "%s: ", __progname);
        if (fmt != NULL)
            (void)vfprintf(stderr, fmt, ap);
        (void)fprintf(stderr, "\n");
    }

    static void
        warnx(const char *fmt, ...)
    {
        va_list ap;
        va_start(ap, fmt);
        _vwarnx(fmt, ap);
        va_end(ap);
    }

    /*
    * Compute the greatest common divisor of a and b.
    */
    static int
        gcd(int a, int b)
    {
        int c;

        c = a % b;
        while (c != 0) {
            a = b;
            b = c;
            c = a % b;
        }

        return (b);
    }

    /*
    * Exchange the block from nonopt_start to nonopt_end with the block
    * from nonopt_end to opt_end (keeping the same order of arguments
    * in each block).
    */
    static void
        permute_args(int panonopt_start, int panonopt_end, int opt_end,
            char * const *nargv)
    {
        int cstart, cyclelen, i, j, ncycle, nnonopts, nopts, pos;
        char *swap;

        /*
        * compute lengths of blocks and number and size of cycles
        */
        nnonopts = panonopt_end - panonopt_start;
        nopts = opt_end - panonopt_end;
        ncycle = gcd(nnonopts, nopts);
        cyclelen = (opt_end - panonopt_start) / ncycle;

        for (i = 0; i < ncycle; i++) {
            cstart = panonopt_end + i;
            pos = cstart;
            for (j = 0; j < cyclelen; j++) {
                if (pos >= panonopt_end)
                    pos -= nnonopts;
                else
                    pos += nopts;
                swap = nargv[pos];
                /* LINTED const cast */
                ((char **)nargv)[pos] = nargv[cstart];
                /* LINTED const cast */
                ((char **)nargv)[cstart] = swap;
            }
        }
    }

#ifdef REPLACE_GETOPT
    /*
    * getopt --
    *	Parse argc/argv argument vector.
    *
    * [eventually this will replace the BSD getopt]
    */
    int
        getopt(int nargc, char * const *nargv, const char *options)
    {

        /*
        * We don't pass FLAG_PERMUTE to getopt_internal() since
        * the BSD getopt(3) (unlike GNU) has never done this.
        *
        * Furthermore, since many privileged programs call getopt()
        * before dropping privileges it makes sense to keep things
        * as simple (and bug-free) as possible.
        */
        return (getopt_internal(nargc, nargv, options, NULL, NULL, 0));
    }
#endif /* REPLACE_GETOPT */

    //extern int getopt(int nargc, char * const *nargv, const char *options);

#ifdef _BSD_SOURCE
    /*
    * BSD adds the non-standard `optreset' feature, for reinitialisation
    * of `getopt' parsing.  We support this feature, for applications which
    * proclaim their BSD heritage, before including this header; however,
    * to maintain portability, developers are advised to avoid it.
    */
# define optreset  __mingw_optreset
    extern int optreset;
#endif
#ifdef __cplusplus
}
#endif
/*
* POSIX requires the `getopt' API to be specified in `unistd.h';
* thus, `unistd.h' includes this header.  However, we do not want
* to expose the `getopt_long' or `getopt_long_only' APIs, when
* included in this manner.  Thus, close the standard __GETOPT_H__
* declarations block, and open an additional __GETOPT_LONG_H__
* specific block, only when *not* __UNISTD_H_SOURCED__, in which
* to declare the extended API.
*/
#endif /* !defined(__GETOPT_H__) */

#if !defined(__UNISTD_H_SOURCED__) && !defined(__GETOPT_LONG_H__)
#define __GETOPT_LONG_H__

#ifdef __cplusplus
extern "C" {
#endif

    struct option		/* specification for a long form option...	*/
    {
        const char *name;		/* option name, without leading hyphens */
        int         has_arg;		/* does it take an argument?		*/
        int        *flag;		/* where to save its status, or NULL	*/
        int         val;		/* its associated status value		*/
    };

    enum    		/* permitted values for its `has_arg' field...	*/
    {
        no_argument = 0,      	/* option never takes an argument	*/
        required_argument,		/* option always requires an argument	*/
        optional_argument		/* option may take an argument		*/
    };

    /*
    * parse_long_options --
    *	Parse long options in argc/argv argument vector.
    * Returns -1 if short_too is set and the option does not match long_options.
    */
    static int
        parse_long_options(char * const *nargv, const char *options,
            const struct option *long_options, int *idx, int short_too)
    {
        const char *current_argv, *has_equal;
        size_t current_argv_len;
        int i, ambiguous, match;

#define IDENTICAL_INTERPRETATION(_x, _y)                                \
	(long_options[(_x)].has_arg == long_options[(_y)].has_arg &&    \
	 long_options[(_x)].flag == long_options[(_y)].flag &&          \
	 long_options[(_x)].val == long_options[(_y)].val)

        current_argv = place;
        match = -1;
        ambiguous = 0;

        optind++;

        if ((has_equal = strchr(current_argv, '=')) != NULL) {
            /* argument found (--option=arg) */
            current_argv_len = has_equal - current_argv;
            has_equal++;
        }
        else
            current_argv_len = strlen(current_argv);

        for (i = 0; long_options[i].name; i++) {
            /* find matching long option */
            if (strncmp(current_argv, long_options[i].name,
                current_argv_len))
                continue;

            if (strlen(long_options[i].name) == current_argv_len) {
                /* exact match */
                match = i;
                ambiguous = 0;
                break;
            }
            /*
            * If this is a known short option, don't allow
            * a partial match of a single character.
            */
            if (short_too && current_argv_len == 1)
                continue;

            if (match == -1)	/* partial match */
                match = i;
            else if (!IDENTICAL_INTERPRETATION(i, match))
                ambiguous = 1;
        }
        if (ambiguous) {
            /* ambiguous abbreviation */
            if (PRINT_ERROR)
                warnx(ambig, (int)current_argv_len,
                    current_argv);
            optopt = 0;
            return (BADCH);
        }
        if (match != -1) {		/* option found */
            if (long_options[match].has_arg == no_argument
                && has_equal) {
                if (PRINT_ERROR)
                    warnx(noarg, (int)current_argv_len,
                        current_argv);
                /*
                * XXX: GNU sets optopt to val regardless of flag
                */
                if (long_options[match].flag == NULL)
                    optopt = long_options[match].val;
                else
                    optopt = 0;
                return (BADARG);
            }
            if (long_options[match].has_arg == required_argument ||
                long_options[match].has_arg == optional_argument) {
                if (has_equal)
                    optarg = has_equal;
                else if (long_options[match].has_arg ==
                    required_argument) {
                    /*
                    * optional argument doesn't use next nargv
                    */
                    optarg = nargv[optind++];
                }
            }
            if ((long_options[match].has_arg == required_argument)
                && (optarg == NULL)) {
                /*
                * Missing argument; leading ':' indicates no error
                * should be generated.
                */
                if (PRINT_ERROR)
                    warnx(recargstring,
                        current_argv);
                /*
                * XXX: GNU sets optopt to val regardless of flag
                */
                if (long_options[match].flag == NULL)
                    optopt = long_options[match].val;
                else
                    optopt = 0;
                --optind;
                return (BADARG);
            }
        }
        else {			/* unknown option */
            if (short_too) {
                --optind;
                return (-1);
            }
            if (PRINT_ERROR)
                warnx(illoptstring, current_argv);
            optopt = 0;
            return (BADCH);
        }
        if (idx)
            *idx = match;
        if (long_options[match].flag) {
            *long_options[match].flag = long_options[match].val;
            return (0);
        }
        else
            return (long_options[match].val);
#undef IDENTICAL_INTERPRETATION
    }

    /*
    * getopt_internal --
    *	Parse argc/argv argument vector.  Called by user level routines.
    */
    static int
        getopt_internal(int nargc, char * const *nargv, const char *options,
            const struct option *long_options, int *idx, int flags)
    {
        char *oli;				/* option letter list index */
        int optchar, short_too;
        static int posixly_correct = -1;

        if (options == NULL)
            return (-1);

        /*
        * XXX Some GNU programs (like cvs) set optind to 0 instead of
        * XXX using optreset.  Work around this braindamage.
        */
        if (optind == 0)
            optind = optreset = 1;

        /*
        * Disable GNU extensions if POSIXLY_CORRECT is set or options
        * string begins with a '+'.
        *
        * CV, 2009-12-14: Check POSIXLY_CORRECT anew if optind == 0 or
        *                 optreset != 0 for GNU compatibility.
        */
        if (posixly_correct == -1 || optreset != 0)
            posixly_correct = (getenv("POSIXLY_CORRECT") != NULL);
        if (*options == '-')
            flags |= FLAG_ALLARGS;
        else if (posixly_correct || *options == '+')
            flags &= ~FLAG_PERMUTE;
        if (*options == '+' || *options == '-')
            options++;

        optarg = NULL;
        if (optreset)
            nonopt_start = nonopt_end = -1;
    start:
        if (optreset || !*place) {		/* update scanning pointer */
            optreset = 0;
            if (optind >= nargc) {          /* end of argument vector */
                place = EMSG;
                if (nonopt_end != -1) {
                    /* do permutation, if we have to */
                    permute_args(nonopt_start, nonopt_end,
                        optind, nargv);
                    optind -= nonopt_end - nonopt_start;
                }
                else if (nonopt_start != -1) {
                    /*
                    * If we skipped non-options, set optind
                    * to the first of them.
                    */
                    optind = nonopt_start;
                }
                nonopt_start = nonopt_end = -1;
                return (-1);
            }
            if (*(place = nargv[optind]) != '-' ||
                (place[1] == '\0' && strchr(options, '-') == NULL)) {
                place = EMSG;		/* found non-option */
                if (flags & FLAG_ALLARGS) {
                    /*
                    * GNU extension:
                    * return non-option as argument to option 1
                    */
                    optarg = nargv[optind++];
                    return (INORDER);
                }
                if (!(flags & FLAG_PERMUTE)) {
                    /*
                    * If no permutation wanted, stop parsing
                    * at first non-option.
                    */
                    return (-1);
                }
                /* do permutation */
                if (nonopt_start == -1)
                    nonopt_start = optind;
                else if (nonopt_end != -1) {
                    permute_args(nonopt_start, nonopt_end,
                        optind, nargv);
                    nonopt_start = optind -
                        (nonopt_end - nonopt_start);
                    nonopt_end = -1;
                }
                optind++;
                /* process next argument */
                goto start;
            }
            if (nonopt_start != -1 && nonopt_end == -1)
                nonopt_end = optind;

            /*
            * If we have "-" do nothing, if "--" we are done.
            */
            if (place[1] != '\0' && *++place == '-' && place[1] == '\0') {
                optind++;
                place = EMSG;
                /*
                * We found an option (--), so if we skipped
                * non-options, we have to permute.
                */
                if (nonopt_end != -1) {
                    permute_args(nonopt_start, nonopt_end,
                        optind, nargv);
                    optind -= nonopt_end - nonopt_start;
                }
                nonopt_start = nonopt_end = -1;
                return (-1);
            }
        }

        /*
        * Check long options if:
        *  1) we were passed some
        *  2) the arg is not just "-"
        *  3) either the arg starts with -- we are getopt_long_only()
        */
        if (long_options != NULL && place != nargv[optind] &&
            (*place == '-' || (flags & FLAG_LONGONLY))) {
            short_too = 0;
            if (*place == '-')
                place++;		/* --foo long option */
            else if (*place != ':' && strchr(options, *place) != NULL)
                short_too = 1;		/* could be short option too */

            optchar = parse_long_options(nargv, options, long_options,
                idx, short_too);
            if (optchar != -1) {
                place = EMSG;
                return (optchar);
            }
        }

        if ((optchar = (int)*place++) == (int)':' ||
            (optchar == (int)'-' && *place != '\0') ||
            (oli = (char*)strchr(options, optchar)) == NULL) {
            /*
            * If the user specified "-" and  '-' isn't listed in
            * options, return -1 (non-option) as per POSIX.
            * Otherwise, it is an unknown option character (or ':').
            */
            if (optchar == (int)'-' && *place == '\0')
                return (-1);
            if (!*place)
                ++optind;
            if (PRINT_ERROR)
                warnx(illoptchar, optchar);
            optopt = optchar;
            return (BADCH);
        }
        if (long_options != NULL && optchar == 'W' && oli[1] == ';') {
            /* -W long-option */
            if (*place)			/* no space */
                /* NOTHING */;
            else if (++optind >= nargc) {	/* no arg */
                place = EMSG;
                if (PRINT_ERROR)
                    warnx(recargchar, optchar);
                optopt = optchar;
                return (BADARG);
            }
            else				/* white space */
                place = nargv[optind];
            optchar = parse_long_options(nargv, options, long_options,
                idx, 0);
            place = EMSG;
            return (optchar);
        }
        if (*++oli != ':') {			/* doesn't take argument */
            if (!*place)
                ++optind;
        }
        else {				/* takes (optional) argument */
            optarg = NULL;
            if (*place)			/* no white space */
                optarg = place;
            else if (oli[1] != ':') {	/* arg not optional */
                if (++optind >= nargc) {	/* no arg */
                    place = EMSG;
                    if (PRINT_ERROR)
                        warnx(recargchar, optchar);
                    optopt = optchar;
                    return (BADARG);
                }
                else
                    optarg = nargv[optind];
            }
            place = EMSG;
            ++optind;
        }
        /* dump back option letter */
        return (optchar);
    }

    /*
    * getopt_long --
    *	Parse argc/argv argument vector.
    */
    int
        getopt_long(int nargc, char * const *nargv, const char *options,
            const struct option *long_options, int *idx)
    {

        return (getopt_internal(nargc, nargv, options, long_options, idx,
            FLAG_PERMUTE));
    }

    /*
    * getopt_long_only --
    *	Parse argc/argv argument vector.
    */
    int
        getopt_long_only(int nargc, char * const *nargv, const char *options,
            const struct option *long_options, int *idx)
    {

        return (getopt_internal(nargc, nargv, options, long_options, idx,
            FLAG_PERMUTE | FLAG_LONGONLY));
    }

    //extern int getopt_long(int nargc, char * const *nargv, const char *options,
    //    const struct option *long_options, int *idx);
    //extern int getopt_long_only(int nargc, char * const *nargv, const char *options,
    //    const struct option *long_options, int *idx);
    /*
    * Previous MinGW implementation had...
    */
#ifndef HAVE_DECL_GETOPT
    /*
    * ...for the long form API only; keep this for compatibility.
    */
# define HAVE_DECL_GETOPT	1
#endif

#ifdef __cplusplus
}
#endif

#endif /* !defined(__UNISTD_H_SOURCED__) && !defined(__GETOPT_LONG_H__) */
